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Cisco Bug: CSCup74238 - Jabber desktop sharing quality varies due to cached low bandwidth level

Last Modified

Feb 26, 2015

Products (1)

  • Cisco UC Integration(TM) for Microsoft Lync

Known Affected Releases

9.7(0) 9.7(1)

Description (partial)

Symptom:
When using Desktop Sharing (BFCP) on Jabber for Windows, the resolution varies due to cached bandwidth level in user system.

Jabbers video engine supports two kinds of video calls.
 
1.      Using a technology called flux.
2.      Using SDP parameters in SIP.
 
If the endpoints don't support flux, then Jabber will use SDP. 
When you make a call between two devices, the standard of the call quality is cached and the next call the two endpoints make will start at that quality. It will then try and increase the quality as the call goes on if possible.
In certain scenario's (bad network), flux capable devices will not use flux and revert back to use SDP.
Once this happens, this low bandwidth level is cached and can never recover from then on.

Conditions:
Jabber for windows desktop sharing over a network where bandwidth level is varying
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